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Emergency Air Brake Air Valve


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We have a 2008 HR Endeavor. The emergency air brake is set but it won't allow the haudraulic jacks to go down because it says to engage the air brake. The Air brake is engaged.  There is a electric solenoid under the panel by the drivers seat. Could this be bad? The Air brake assembly is Midland. Any suggestions?

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Excellent PDF and exploration of the issue. I am surprised that you can't just get a replacement from the heavy-duty trucking industry. I would have thought there would be millions of switches like that in service on the road that could be retrofitted. 

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  • 4 weeks later...

When mine was doing this, I ordered a replacement Nason parking brake switch online and replaced the defective one and that fixed my issue. 

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